I would prefer the 5170P. I like the fact that bezel is smaller compared to the 5070P, I like the fact that the watch is more wearable, I even like the diamond markers which contrast beautifully against the dial. A sure winner in my books! Sorry gentlemen, I have always felt that the 5070 range was over rated and with the introduction of 5170P, I believe Patek has produced its best looking chronograph in 60 or 70 years.